nervesplice Posted September 28, 2013 Share #1 Â Posted September 28, 2013 Advertisement (gone after registration) Hi, Â I have a 90mm Cron APO ASPH and have noticed that the screw holes on the focus ring are missing the screws. I've looked at pictures online and see that some have screws and others appear to have them missing also. Is this correct or should I be sending it to Solms for repair? Â Thanks, Â James Link to post Share on other sites More sharing options...
Advertisement Posted September 28, 2013 Posted September 28, 2013 Hi nervesplice, Take a look here 90mm Cron APO ASPH Missing Screws. I'm sure you'll find what you were looking for!
lct Posted September 28, 2013 Share #2 Â Posted September 28, 2013 Mine has never had screws there either. I don't know what the purpose of those holes may be but there is no play in the focus ring so i don't care personally. Link to post Share on other sites More sharing options...
Erik Gunst Lund Posted September 30, 2013 Share #3 Â Posted September 30, 2013 Some lenses have a plug-screw on top of the set-screw if the threads are deep. I don't know if this is the case for this lens also... Link to post Share on other sites More sharing options...
algrove Posted September 30, 2013 Share #4 Â Posted September 30, 2013 There is something in my holes, but they appear to be deep and I seem to notice like a sealing paint or whatever down in each hole. Sorry for the lousy explanation, but I never really looked or noticed anything. Sure seems to work well for me so it seems I should not care and get out and use it. Link to post Share on other sites More sharing options...
01af Posted September 30, 2013 Share #5 Â Posted September 30, 2013 Same here. There are three holes in the focus ring's grip, evenly spaced around the circumference, which look as if there were tiny screws missing. So it seems normal for this lens. I guess the holes are used by a special tool for service purposes. Link to post Share on other sites More sharing options...
lct Posted September 30, 2013 Share #6 Â Posted September 30, 2013 Some samples have screws though. Link to post Share on other sites More sharing options...
Bill W Posted October 1, 2013 Share #7 Â Posted October 1, 2013 Advertisement (gone after registration) My wife thought I was missing a few screws when she found out I bought a 50 APO-Summicron Link to post Share on other sites More sharing options...
asmith Posted October 1, 2013 Share #8 Â Posted October 1, 2013 They do exist then. Alwyn Link to post Share on other sites More sharing options...
algrove Posted October 1, 2013 Share #9  Posted October 1, 2013 My wife thought I was missing a few screws when she found out I bought a 50 APO-Summicron  And you could proudly say you know you are crazy with more GAS than most. Link to post Share on other sites More sharing options...
UliWer Posted October 1, 2013 Share #10 Â Posted October 1, 2013 Some samples have screws though. Â Serial numbers should indicate the difference: Â Mine with 38814xx (from 2000) has three tiny screws. Â If one can name a serial number not much higher without screws we might get an idea when they changed it. Link to post Share on other sites More sharing options...
01af Posted October 1, 2013 Share #11 Â Posted October 1, 2013 Mine with 38814xx (from 2000) has three tiny screws. Mine (without screws but with three holes which look as if screws belonged there) is 3918XXX. Link to post Share on other sites More sharing options...
UliWer Posted October 1, 2013 Share #12 Â Posted October 1, 2013 That's closer than I expected - from 2002. So we can guess that they changed it around 2001. Â According to Thiele's "Kleines Fabrikationsbuch Leica Objektive (3. edit 2007) there was no batch of 90mm Apo Summicrons Asph in 2001 since he dates some batches with higher 3,8xxx,xxx numbers with 1999, and then 200 (3,918,401 to 3,918,600) from 2002. Link to post Share on other sites More sharing options...
01af Posted October 1, 2013 Share #13 Â Posted October 1, 2013 According to Thiele's "Kleines Fabrikationsbuch Leica-Objektive (3rd ed. 2007)", there was no batch of Apo-Summicron-M 90 mm Asph in 2001 ... According to Erwin Put's Leica Pocket Guide, my lens (bought used) is from a 2001 batch: 3918271 - 3918770, 500 pieces. Link to post Share on other sites More sharing options...
UliWer Posted October 1, 2013 Share #14 Â Posted October 1, 2013 Puts may be right. Thiele's dates for the last years he lists don't seem very consistent. Link to post Share on other sites More sharing options...
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